This is a PACKLINE Cargo Topper. This is the top of the line cargo topper and the original cargo topper. It is fiberglass and low profile. It has two "strong arms" to hold up the lid when loading or unloading. These are $1,000 plus when new. I'm asking $250. I took this topper through rains ahead of a hurricane in Corpus Christi, Texas and the rain was coming down in BUCKETS and it never got a drop of moisture inside the topper. $250 CASH!